Batch Selected to active Baking
BakeTool addon can handle it !

There is a mode that i haven't try yet, which is the Atlas mode (default is individual).
The support of baketool answer me :


  There’s a “Target” option in the Atlas Mode. It works as the “Selected
  to active”. On this mode all the objects in the Object List are used
  as sources and the target is the “actived” one to be baked. See that
  in this case the target need a valid non overlapped UV.


I definitively love this addon, anyone who use blender and make realtime 3d should have it :)